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A biographer who profiled Pat Tillman says the U.S. soldier and former NFL star, who was killed by friendly fire in Iraq in 2004, would have found NFL quarterback Colin Kaepernick's protests against police brutality "admirable" and likely would have joined the demonstrations.

"Pat would have found Kaepernick an extremely admirable person for what he believed in,” Krakauer told the Post.

“I have no doubt if he was in the NFL today, he would be the first to kneel," he added. "So there is irony about what is going on.”

Krakauer's comments came after Zeldin said Tillman would have been a "better choice" to headline Nike's campaign.

The New York lawmaker and other Republicans pointed to Tillman as an example of an American who had truly sacrificed everything, a shot at Nike and Kaepernick for the ad's slogan, which hints at the career sacrifices Kaepernick has endured following his protests during the national anthem.

Trump and other Republicans have called on the league to punish the players who have participated in the protests against police brutality and racism, calling the demonstrations an attack on the military or service members.